Introduction; System Considerations - Toshiba Strata DK24 Installation And Maintenance Manual

1 INTRODUCTION

1.01 STRATA DK systems are flexible in their
ability to meet a broad range of customer configu-
ration requirements. A modular building block ap-
proach allows the incremental addition of various
parts to meet growing and changing system needs
and applications.
1.02 The main unit of each STRATA DK system is
the key service unit (KSU) which contains universal
slots that can support any of the various station, CO
line, and peripheral printed circuit boards (PCBs)
compatible with the systems. This is contrasted
with a dedicated slot approach (used in previous
STRATA systems), where a particular slot can only
accept a specific PCB, such as a CO line interface
PCB. DK24 has six universal slots, DK56 has eight,
and DK96 has 14. This increased flexibility in
STRATA DK means that trade-offs can be made
between the number of CO lines and stations in a
system application.
AVAILABLE
CO LINES
NOTES (DK24):
1. 24 stations are available with PCTUS1-equipped DK24.
2. 32 stations are available with PCTU-(1, 2, 3, or 4) equipped DK24.
FIGURE 4-1
PCB CONFIGURATION CHART
40
36
32
DK96
28
24
20
DK56
16
12
8
DK24
4
0
0 8 16 24 32 40 48 56 64 72 80 88 96
AVAILABLE STATION PORTS
4-1
INSTALLATION-CONFIGURATION
1.03 Figure 4-1 shows that in most configurations,
four CO lines can be traded for eight stations.
Conversely, for every eight stations that are given
up, four CO lines can be added. The maximum
quantities of 16 CO lines for DK24, 20 CO lines for
DK56, and 36 CO lines for DK96 are based on
squared systems. Software allows 16 CO lines with
PCTUS and 36 CO lines with PCTU (1, 2, 3, or 4).
Similarly, the 24 station (PCTUS) and 96 station
(PCTU1, 2, 3, or 4) limits are also software limita-
tions.

1.10 System Considerations

1.11 When no external options or TIE lines are
installed and only CO lines and station PCBs are
exchanged, the maximum configurations can be
summarized in Table 4-A.
1.12 Table 4-A shows the maximum number of
digital telephones (2000- and 1000-series), 6500-
series electronic telephones, and/or standard tele-
SECTION 400-096-204
SEPTEMBER 1992
(WITHOUT
SYSTEM OPTIONS)